Tumbler switch



R ALKAN. TUMBLER SWITCH.

APPLICATION FILED AUG.2.1920.

L LSYJOQ. Patented Dec. 5,1922.

Patented Dec. 5,'

. ROBERT ALKAN', or PARIS, FRANCE.

TUMBLER SWITCH. Application filed August 2, 1920. Serial No. 400,879.

To all wko'in it may concern:

Be it known that I, ROBERT ALKAN, a

- citizen of the French Republic, residing at .Switches,

have invented certain new Improvements in Tumbler of which the following is a speci- Paris, France, and useful fication.

This invention relates to a switch with oscillating lever of the type generally known as tumbler switches and it has further for its purpose to improve the construction of such switches so that it becomes very simple nals neither screws nor nuts nor threadings tion is shown by but compact. The improved switch can be mounted easily as, with the exception of the screwsifo'r clamping the wires in the termiare used.

In the accompanying drawing the. invenway of example. I Big. 1 is a longitudinal section showing the improved tum'bler switch on a larger than the natural size.

- Fig. 1* is a horizontal. A-A of 1.

Fig. 2 shows a simple contact blade. Fig. 3 shows a-double contact blade. Figs. 4, 5 and 6 show various forms of the spring inserted between the'handle and the section on line support for the contact blades.

According to the invention the body of the switch consists of a porcelain block a in which the contact pieces, b-'b are sealed. This block, which is hollow at its lower part has a circular opening 0 at the top from which projects the tumbling lever (Z, toturn around an axle e. The contact blades 7 are mounted upon a support 72. adapted to pivot around a transverse axle a which is mounted intwo bayonet-brackets j. Insulating washers g are interposed between the contact blades f and the support h.,

A very strong spiral spring is is placed with its upper end upon the lower end of the oscillating handled nd with its lower end upon the head part ?of the support It. This spring It serves exclusively to establish a mechanical connection between the tumbling handle and the oscillating support 12., owing to its working on compression and on breakin' In-th s manner there is ensured: I

(1) .An energetic and constant pressure of the blades upon the contact pieces;

(2) A very sudden breaking I tact, whereby any adapted of the conintermediate position be comes impossible; i

(3) The stability of the two pivot axles e and z, owing to the strong axial reaction which immobilises the same upon the ground offtheir bearings.

Theinsulation of the knob d whichis the only outer metallic part, is perfectly ensured through the two insulating washers g.

The contact screws m can be easily removed from the threaded holes .no which are provided for this purpose in the contact pieces I). a

In the simple interrupter shown in Fig. 1 only simple blade springs f are used. for establishing the contact or for interrupting the same. A reciprocating switch with double breaking can be built according to the principles which have just been described by using the double blade springs 2 (Fig. 3) and providing two supplementary terminals.

Instead of the spiral spring which connects the handle with the support of the .blade springs a blade spring of steel or other elastic metal, folded or undulated as shown in Figs. 4, 5 and 6 or of other similar shape could be used.

The block and support could be made in two pieces, with or without a lid according to requirement.

claim An improved tumbler switch comprising in combination with a socket, two terminals fixed in said socket, a contact spring, a support for said contact spring ivotally mount ed in said socket, an upwar y directed propivotally fixed in the upper end of said socket, a downwardly directed projection of said tumbling handle, and a spiral spring mounted upon said projection of the tumbling handle and of the pivotable support for the contact blade so that when'the tum bling handle is oscillated said spring opjection of said support, a tumbling handle 

